时间：2023年11月2日 15:00 ～ 18:00

会议地址：物理A楼229会议室

主讲人：肖洋

单位：中国科学院  理论物理所

摘要：In order to study the validity of analytical formulas used in the calculation of characteristic physical quantities related to vacuum bubbles, we conduct several numerical simulations of bubble kinematics in the context of cosmological first-order phase transitions to determine potentially existing systematic uncertainties. By comparing with the analytical results, we obtain the following observations: (1) For the total number of bubbles, there is a 10% discrepancy between the values from simulations and from analytical prediction; (2) For the false vacuum fraction, the difference between the results from simulations and from analytical prediction is small, which, however, plays a crucial role in explaining the discrepancy observed in the total number of bubbles; (3) The bubble lifetime distribution obtained from the simulations deviates from the exponential distribution and is not obviously influenced by different nucleation rates; (4) These differences propagate into the final gravitational waves spectra, which we calculate with the sound shell model for the usually dominant contribution from sound waves, and find that the bubble number deviation enhances the peak value in the gravitational wave spectra, while the deviation in the lifetime distribution suppresses the peak value.

邀请人：张阳